railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry

हवेच्या गुणवत्तेची खात्री करण्यासाठी कार्बन मोनॉक्साईडची प्राथमिक मानक पातळी काय आहे?

1
90 ppm
2
1 ppm
3
9 ppm
4
10 ppm
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